Telegraph-sounder



(Nd Model.)

w. E. DAVIS. TELEGRAPH SOUNDER.

Patented Mar. 6

fig].

if V INVENTOR ml. 2. 027W BY fink- ATTORNEYJ UNITED STATES PATENTOFFICE.

XVILLIAM E. DAVIS, OF JERSEY CITY, NEW JERSEY.

TELEGRAPH-SOUNDER.

SPECIFICATIONforming part of Letters Patent No. 273,264, dated March 6,1883, Application filed December 8, 1882. (No model.)

.T 0 all whom it may concern Be it known that I, WILLIAM EDWARD DA- VIs,of Jersey City, in the county of Hudson and State of New Jersey, haveinvented an Improved Telegraph-Instrument, of which the iollowing is aspecification.

Figure 1 is a sectional elevation of my improved telegraph-instrument;Fig. 2, a side view of the same, showing it attached to a wall-bracket;Fig. 3, a sectional elevation of the same, showing it inaprotecting-housing; Fig. 4, a horizontal section thereofon the plane ofthe line 0 c, Fig. 3; and Fig. 5, a side view, partly in section, ofanother modification of the same.

This invention relates to a new telegraphinstrument which can he used asa receivinginstrument or sounder, and for analogous purposes; and itconsists principally in placing an electro-magnet having a fixed corewithin a soft-iron frame, in which the movable armature is also guided.The armature is vertically beneath. The electro'magnct is magnetized bythesurroundingsoft-iron framing, and therelore the more readilyattracted to the electromagnet when the current is established, droppingaway from the same when the current is interrupted.

The invention also consists in other details of improvement, that arehereinafter more clearly pointed out.

In the accompanying drawings, the letter A represents a frame, made ofsott iron, preferably of two upright bars, a a, of atop cross-bar, b,and lower cross-bars, d and e, as shown in Figs. 1 and 3 and also inFig. 2, and to the upper cross-bar, b, of this frame A is secured thefixed core B of an electro-magnet,0. Di rectly below this fixed core Bis placed the movable armature D, which is also made of soft iron. Thestem of this movable armature D is guided in the cross-bars d e, and isfree to move up and down therein, but isinsulated therefrom byintervening bushing f, of brass or other unmagnetizable material, asshown in the drawings. The insulating bushing in the lower cross-bar, 0,may, if desired, be in form of a nut, g, which is screwed upon thethreaded lower portion of the stem of the armature D, as more clearlyshownin Fig. 1. The insulating parts interposed between the stem of themovable armature D and the soft-iron fraineA are for the purpose ofpreventing the iron of the frame from coming in contact with the iron ofthe movable armature, and to prevent sticking of the movable armature,giving it full freedom to drop by its own gravity off the electromagnet,whereas without these interposed bushings the armature D and iron frameA, being in contact, would cause the armature to stick, and not allow itto drop freely when the circuit was interrupted.

Although in the accompanying drawings I have shown the movable armatureD to be capable of moving in an np-and-down direction only, yet the sameprinciple of invention can be applied to an armature having a vibratorymotion instead of a rectilinear motion, so long as its gravity can be utlized for carrying it away from the electro-magnet.

The conductors from the battery connect with the electro-magnet B O, asindicated in Fig.1, where the letters It and 41 represent theseconductors, and when the circuit is closed and the electro-magnetcharged the'result will be that the stationary core B, and also thesoftiron frame A, and likewise the armature D, will be magnetized, sothat the south pole of the armature will be near to the north pole ofthe fixed core, or vice versa, thus facilitating the lifting of thearmature by the mutual attraction of the two. Were it not for theplacing of this armature D into the soft-iron magnetized frame, thepower required for lifting it would have to be greater, and a strongerbattery-power would be required. When the' current is interrupted thearmature D instantly drops by its own weight away from the fixed core B,and thus, by proper manipulations of the key of thetransmitting-instrument, the armature D can be caused to ascend and dropwith pulsations of the requisite extent and relative duration, and indropping, as well as in ascending, the same will produce the clickingnoises common totelegraph-instruments for the purpose of allowing themessage to be understood by the ear.

The play of the armatureD can be regulated by the nut g, which, whenturned, will cause the upper enlarged end of the armature D to benormallynearer to or farther away from the lower end of the fixed coreB; but this nut g can only be manipulated when the instrument isstationary or not in use.

If it is desired to apply means for adjusting the stroke of the armatureD during the action of the instrument, it can be produced in the formindicated in Fig. 5that is to say, by means of a spring-bar, j, engagingunder a shoulder or enlargement, l, of the nut g, or of one of thebushings, and forced down upon another shouldeno, by a screw, m, to agreater orless extent. The screw m, being supported by a post, a, whichis at a shortdistance from the frameAand its attachments, can be movedduring the play of the instrument, and when moved will either relax thespring-bar j so as to normallylift the armature higher or depress it soas to keep it farther away normally from the electro-magnet; orsubstantially such a spring, or a weaker one than that shown in Fig. 5,may be supported on a post and depressed by a screw upon the head of thenut g, with substantially the same effect,it being understood that whenthe electro-magnet attracts the armature the force of said spring has tobe overcome.

The operation of the instrument is as follows: hen the circuitis closedthe fixed core B, the armature D, and the frame A are all magnetizedtogether, and the armature D, passing thronghihe brass bushings,beingthe only movable part of the mechanism, is drawn upward toward the fixedpole of the core B, making a clicking noise. Then the circuit is brokenthe armatureDfalls freely down by its own weight until arrested by oneof the crossbars (I e, producing thereby another clicking noise, andthus, as the establishment and interruptiou of the current arerepeated,this clicking noise is produced at proper intervals. Thedistance between the poles can be regulated by the lower nut, g, or bythe upper bushing, if desired, and,in connection therewith, by thespring j and screw m, as hereinbefore stated.

The entire instrument may be inclosed in a shell, E, as shown in Fig. 3,which shell can be held fast to the instrument by a screw-connection,1), running up from the top of the framing A. The lower part of thisinclosingshell E may be perforated; or any other part thereof may beperforated to let the sound produced by the motion of the armature D befreely heard. The lower part of the nut g, or a separate nut, (Fig.1shows the said nut made in two parts,) constitutes a weight to thearmature D, to assist in pulling it down; but, instead of that weightalone, a slight spring, regulated by a suitable thumb-screw, may be usedto assist it, which spring would hear upon said weight or lowerenlargement.

I claim- 1. The combination of the soft-iron framing A, having one ormore cross-bars, d e, for guiding the movable armature, with the fixedcore B, that is attached to said framing, fixed electromagnet (J on saidcore, and with the movable armature D, which is guided in said softironframing A, below said electro-magnet, and with theinsulatorf,substantially as herein shown and described.

2. The combination of the soft-iron frame A, carrying the fixed electromagnet O and its fixed core B, with the movable armature D, which isguided in said frame A, below said electro-inagnet, and with the bushingf and nut g, substantially as described.

3. The combination of the soft-iron frame A and fixed electro-magnetB Gwith the movable armature D, guided in said frame A, and with a springand adj ustin g-screw, said spring hearing upon an enlargement orshoulder of the movable armature l), substantially as described.

4. The combination of the soft-iron frame A, carrying the fixedclectro-magnetB O,with the movable armature D and with the perforatedshell E, inclosing the said parts A, B, U, and D, substantially asherein shown and described.

This specification of my invention signed by me the 2d day of December,1882.

WILLIAM EDWARD DAVIS.

lVitnesses:

WILLIAM H. 0. SMITH, J ULIUS HUELSEN, Jr.

